3Com PathBuilder S200 Series Manuel utilisateur

3Com®Corporation

PathBuilder™S200 Series Switch

Voice Over IP

Notice

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without the express prior permission of an officer of 3Com, may not be copied, reproduced,

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This document is for information purposes only and is subject to change without notice.

Part No. T0008-48, Rev. B

First Printing October 1998

Manual is current for Release 5.2M.

Voice Over IP 1

Voice Over IP

Overview

Introduction This document describes the Voice Over IP (VoIP) feature for 3Com’s PathBuilder

S200 series switch Products.

Note

Parameters and applications for voice traffic are discussed in the manual. For

information on SoTCP and serial data applications, refer to the IP and LAN

Feature Protocol documentation.

In This Manual Topic See Page

About Voice over IP (VoIP) .......................................................................... 2

Network Topology ................................................................................... 3

SoTCP Operation ..................................................................................... 4

Establishing a Call ................................................................................... 5

VoIP Applications ......................................................................................... 8

Example VoIP Configuration ................................................................... 9

Configuring VoIP .......................................................................................... 11

SoTCP Parameters ................................................................................... 12

Route Selection Table Parameters ............................................................ 15

SoTCP Map Table Parameters ................................................................. 16

Statistics ........................................................................................................ 18

SoTCP Statistics ....................................................................................... 19

SoTCP Detailed Statistics ........................................................................ 20

Glossary of Terms These terms appear throughout this document:

• ACP - Adjacent Channel Protocol

• VoIP - Voice over IP

• SVC - Switched Virtual Circuit

• UDP - User Datagram Protocol

• SoTCP - Serial Protocol Over TCP

2 Voice Over IP

About Voice over IP (VoIP)

What is VoIP? PathBuilder S200 series switch products support Voice over IP (VoIP) to provide

termination and encapsulation of voice and fax traffic for transport over an IP

network (see to Figure 1). 3Com’s proprietary protocol, Serial Protocol over TCP

(SoTCP), provides the encapsulation mechanism for carrying voice traffic over an IP

network.

Figure 1. Voice over IP Network

VoIP Applications VoIP provides new and cost effective solutions for a company’s telephony

communication including:

• Long distance calling over an Intranet or the Internet

• Remote location dial-in and telecommuting

Features Key features include:

• real-time voice and fax over IP networks

• multiple SVCs over a single UDP session

• call management and signalling using TCP

Product Support These PathBuilder S200 series switches support VoIP:

• PathBuilder S21x switch

• PathBuilder S24x, 26x, and 27x switch

PBX

IP Network

Fax

modem

Fax

Voice Over IP 3

T0008-48/B Revision 5.2

About Voice over IP (VoIP)

Network Topology

Introduction This section describes a typical network topology for the application of VoIP.

Network Topology Figure 2 illustrates a typical network topology for voice traffic.

Figure 2. Example Network Topology

Node Conventions The node conventions described below refer to Figure 2 and are used throughout this

document.

IP Network

PB S200

Source IP Node PB S200 Destination

IP Node

PBX

Voice Device

Voice

Network

Voice Device

Voice

Network

Convention Description

Voice Device or Network The voice device or network sends voice to

the voice port on the source IP node.

Source IP Node The source IP node is a PathBuilder S200

series switch that

• connects directly to the voice device.

• connects directly to the IP network.

• connect directly to a frame relay network

supporting voice.

• encapsulates voice received from the

voice device or network using 3Com’s

SoTCP protocol.

• initiates calls to the peer, the destination

IP node.

Destination IP Node The destination IP node is a PathBuilder

S200 series switch that receives SoTCP

packets sent from the source IP node over the

IP network. The destination IP node

un-encapsulates SoTCP packets and sends

voice traffic to the PBX.The PBX may also

connect to a frame relay network supporting

voice.

PBX The PBX connects to the destination IP node

and receives voice traffic from it.

4 Voice Over IP

About Voice over IP (VoIP)

SoTCP Operation

Introduction This section describes the operation of SoTCP protocol. SoTCP provides the

encapsulation method for carrying voice traffic over an IP network.

SoTCP Packet

Format The SoTCP protocol terminates voice traffic received from a voice device and

prefixes the traffic with a 3-byte SoTCP header or 4-byte SoTCP header, depending

on the version of SoTCP protocol. Figure 3 illustrates the SoTCP packet.

Figure 3. SoTCP Packet Format

The SoTCP header contains information that will allow a destination IP node to

reconstruct the voice packet at the remote end.

Transport

Mechanism To carry voice traffic over IP, SoTCP uses two Transport layer protocols, the

Transport Control Protocol (TCP) and User Datagram Protocol (UDP).

Each TCP or UDP session may carry multiple switched virtual circuits (SVCs).

SoTCP uses SVC call setup and routing procedures to establish voice SVCs.

3 or 4 Byte SoTCP Header Data

Transport

Layer

Protocol

Traffic Carried Description

TCP Voice Signalling Traffic SoTCP uses TCP to carry voice signalling

traffic because TCP provides reliable,

sequenced packet delivery. Voice

signalling traffic encapsulated by SoTCP

must arrive at the destination node without

error or delay. TCP implements error

recovery for duplicate or lost packets.

UDP Audio and Fax SoTCP transports audio and fax traffic

over UDP session. Unlike TCP, UDP

provides fast and simple transaction

services with minimal protocol overhead.

UDP provides a best-effort, transport

mechanism only and does not ensure

reliable delivery.

Voice Over IP 5

T0008-48/B Revision 5.2

About Voice over IP (VoIP)

Establishing a Call

Introduction This section describes call establishments. Figure 4 shows the packets exchanged for

session and connection establishment and finally, voice transfer.

Figure 4. Session and Connection Establishment

Voice Port Voice Port

ACP call request

TCP call request

TCP Call accept

SoTCP internal call request

ACP call request

ACP call accept

SoTCP internal call accept

ACP call accept

Source IP Node Destination IP Node

Session Setup

Connection Setup

Voice

Data Transfer

Open UDP channel

6 Voice Over IP

About Voice over IP (VoIP)

Establishing a

Session Before voice traffic can pass between the voice ports over the network, the source IP

must establish a TCP and UDP session with the destination IP node. Each session is

uniquely identified by a source IP address, destination IP address, source port

number, and destination port number. The source and destination node exchange the

following call packets to establish a session:

Establishing a

Connection After opening a TCP and UDP session, the source node must establish an SoTCP

connection with the destination IP node. Each TCP session support multiple

connections or SVCs. A unique connection identifier identifies each connection

multiplexed on a TCP session. The source and destination IP nodes exchange the

following call packets to establish a connection:

Stage Packet Transferred Description

1ACP Call Request The voice port sends an ACP (Adjacent

Channel Protocol) Call Request to inform

the source IP node that it wishes to send

voice over the network to the destination

voice port.

Open UDP When a voice port attempts to make a call,

the Source IP node opens a UDP channel.

2TCP Call Request To open a session, the source IP node sends a

TCP call request to the destination IP node.

TCP Call Accept The destination IP node responds to the Call

Request by sending a Call Accept, and

establishes a TCP session.

Stage Packet Transferred Description

1SoTCP Internal Call

Request The source IP node sends an internal

SoTCP call request packet with the UDP

port number included, to the destination IP

node. The destination IP node examines the

facilities field in the header to determine

the presence of voice traffic. If voice traffic

is present, the destination IP node opens a

UDP channel.

The destination IP node uses the UDP port

number in the internal SoTCP call request

packet to identify the destination port for

UDP packets.

2ACP Call Request The destination IP node sends an ACP call

request to the remote voice port.

ACP Call Accept To accept the call, the voice port responds

with an ACP Call accept packet.

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